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Significant Accounting Policies (Details 1) - USD ($) | Dec. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Allowance for doubtful receivables | $ 669,000 | $ 1,081,000
Customer C |  |
Allowance for doubtful receivables | 500,000 | 800,000
Customer E |  |
Allowance for doubtful receivables | 0 | 198,000
Other Allowances |  |
Allowance for doubtful receivables | $ 169,000 | $ 83,000

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- Definition For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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